Measurement of the Branching Fraction, Polarization, and CP Asymmetries in $B^0 \to \rho^0 \rho^0$ Decay, and Implications for the CKM Angle $\alpha$ - INSPIRE

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Measurement of the Branching Fraction, Polarization, and CP Asymmetries in $B^0 \to \rho^0 \rho^0$ Decay, and Implications for the CKM Angle $\alpha$

BaBar

Collaboration

•

Bernard Aubert
(
- Paris U., VI-VII
)

Jul, 2008

7 pages

Published in:

Phys.Rev.D 78 (2008) 071104

e-Print:

0807.4977 [hep-ex]

DOI:

10.1103/PhysRevD.78.071104

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit \rho}^{0}}{{\mathit \rho}^{0}}

Report number:

SLAC-PUB-13329,
BABAR-PUB-08-031

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (arXiv)

We study B0->rho0rho0 decays in a sample of 465*10^6 Upsilon (4S)->BBbar events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B = (0.92 +/- 0.32 +/- 0.14)*10^{-6} and longitudinal polarization fraction f_L = 0.75^{+0.11}_{-0.14} +/- 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B0->rho0rho0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S^{00}_L = (0.3 +/- 0.7 +/- 0.2) and C^{00}_L = (0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.

Note:

7 pages, 2 figures, submitted to Phys. Rev. Lett

11.30.Er
12.15.Hh
13.25.Hw
electron positron: annihilation
B: pair production
B0: hadronic decay
rho(770)0: pair production
asymmetry: CP
time dependence
B0: branching ratio

References(20)

Figures(2)

Unitary Symmetry and Leptonic Decays

Nicola Cabibbo
(
- CERN
)

- Phys.Rev.Lett. 10 (1963) 531-533,
- Also in *Bologna 1984, Proceedings, Fifty years of weak-interaction physics* 648-649
•
DOI:
- 10.1103/PhysRevLett.10.531

CP Violation in the Renormalizable Theory of Weak Interaction

Makoto Kobayashi
(
- Kyoto U.
)
,
Toshihide Maskawa
(
- Kyoto U.
)

- Prog.Theor.Phys. 49 (1973) 652-657,
- Also in *Lichtenberg, D. B. (Ed.), Rosen, S. P. (Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 218-223.
•
DOI:
- 10.1143/PTP.49.652

Isospin analysis of CP asymmetries in B decays

Michael Gronau
(
- Technion and
- DESY
)
,
David London
(
- Montreal U.
)

- Phys.Rev.Lett. 65 (1990) 3381-3384
•
DOI:
- 10.1103/PhysRevLett.65.3381

Evidence for $B^0 \to \rho^0 \rho^0$ decay and implications for the CKM angle $\alpha$

BaBar

Collaboration

•

Bernard Aubert
(
- Savoie U. and
- Annecy, LAPP
)

et al.

- Phys.Rev.Lett. 98 (2007) 111801
•
e-Print:
- hep-ex/0612021
•
DOI:
- 10.1103/PhysRevLett.98.111801

Observation of B+ ---> rho+ rho0

Belle

Collaboration

•

J. Zhang
(
- Tsukuba U.
)

et al.

- Phys.Rev.Lett. 91 (2003) 221801
•
e-Print:
- hep-ex/0306007
•
DOI:
- 10.1103/PhysRevLett.91.221801

Measurements of branching fraction, polarization, and charge asymmetry of $B^\pm \to \rho^\pm \rho^0$ and a search for $B^\pm \to \rho^\pm$ f0(980)

BaBar

Collaboration

•

Bernard Aubert
(
- Barcelona U., ECM
)

et al.

- Phys.Rev.Lett. 97 (2006) 261801
•
e-Print:
- hep-ex/0607092
•
DOI:
- 10.1103/PhysRevLett.97.261801

A Study of B0 ---> rho+ rho- Decays and Constraints on the CKM Angle alpha

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 76 (2007) 052007
•
e-Print:
- 0705.2157
•
DOI:
- 10.1103/PhysRevD.76.052007

Measurement of the branching fraction, polarization, and CP asymmetry for B0 ---> rho+ rho- decays, and determination of the CKM phase phi(2)

Belle

Collaboration

•

A. Somov
(
- Cincinnati U.
)

et al.

- Phys.Rev.Lett. 96 (2006) 171801
•
e-Print:
- hep-ex/0601024
•
DOI:
- 10.1103/PhysRevLett.96.171801

Comment on extracting alpha from B ---> rho rho

- Phys.Rev.D 69 (2004) 011502
•
e-Print:
- hep-ph/0310242
•
DOI:
- 10.1103/PhysRevD.69.011502

Review of Particle Physics

et al.

- J.Phys.G 33 (2006) 1-1232
•
DOI:
- 10.1088/0954-3899/33/1/001

The BaBar detector

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Nucl.Instrum.Meth.A 479 (2002) 1-116
•
e-Print:
- hep-ex/0105044
•
DOI:
- 10.1016/S0168-9002(01)02012-5

Improved measurement of CP asymmetries in $B^0 \to (c \bar{c}) K^{(*)0}$ decays

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.Lett. 94 (2005) 161803
•
e-Print:
- hep-ex/0408127
•
DOI:
- 10.1103/PhysRevLett.94.161803

The EvtGen particle decay simulation package

D.J. Lange
(
- LLNL, Livermore
)

- Nucl.Instrum.Meth.A 462 (2001) 152-155
•
DOI:
- 10.1016/S0168-9002(01)00089-4

GEANT4 - A Simulation Toolkit

GEANT4

Collaboration

•

S. Agostinelli
(
- Genoa U.
)

et al.

- Nucl.Instrum.Meth.A 506 (2003) 250-303
•
DOI:
- 10.1016/S0168-9002(03)01368-8

Study of the D+(s) ---> pi- pi+ pi+ decay and measurement of f(0) masses and widths

E791

Collaboration

•

E.M. Aitala

et al.

- Phys.Rev.Lett. 86 (2001) 765-769
•
e-Print:
- hep-ex/0007027
•
DOI:
- 10.1103/PhysRevLett.86.765

Measurements of branching fractions, polarizations, and direct CP-violation asymmetries in $B \to \rho K^{}$ and $B \to$ f0(980) $K^{}$ decays

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.Lett. 97 (2006) 201801
•
e-Print:
- hep-ex/0607057
•
DOI:
- 10.1103/PhysRevLett.97.201801

Averages of $b-$ hadron properties at the end of 2006

HFLAV

Collaboration

•

E. Barberio

et al.

e-Print:
- 0704.3575

Measurements of CP-Violating Asymmetries in $B^0 \to$ a+-(1) (1260) $\pi^\mp$ decays

BaBar

Collaboration

•

Bernard Aubert
(
- Savoie U. and
- Annecy, LAPP
)

et al.

- Phys.Rev.Lett. 98 (2007) 181803
•
e-Print:
- hep-ex/0612050
•
DOI:
- 10.1103/PhysRevLett.98.181803

Observation of B0 Meson Decay to a+-(1)(1260) pi-+

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.Lett. 97 (2006) 051802
•
e-Print:
- hep-ex/0603050
•
DOI:
- 10.1103/PhysRevLett.97.051802

Study of $B^0 \to \pi^0 \pi^0$ , $B^\pm \to \pi^\pm \pi^0$ , and $B^\pm \to K^\pm \pi^0$ Decays, and Isospin Analysis of $B \to \pi \pi$ Decays

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 76 (2007) 091102
•
e-Print:
- 0707.2798
•
DOI:
- 10.1103/PhysRevD.76.091102